| 1973 |  | Added default specular lobe to BSDF interpolation. | 
| 1974 |  |  | 
| 1975 |  | Set minimum number of shadow checks before direct optimization (4). | 
| 1976 | + |  | 
| 1977 | + | (Above changes included in 4.2.1 patch release.) | 
| 1978 | + |  | 
| 1979 | + | ****** COMPATIBILITY CHANGE ******** | 
| 1980 | + | Made header input and output the default behavior for dctimestep and | 
| 1981 | + | genskyvec. | 
| 1982 | + |  | 
| 1983 | + | ****** COMPATIBILITY CHANGE ******** | 
| 1984 | + | Changed pabopto2bsdf default behavior to add 90-degree rotation | 
| 1985 | + | to bring pgII's definition of "up" in line with Klems axis | 
| 1986 | + | conventions.  Introduced a new header variable "upphi" to | 
| 1987 | + | control this added rotation.  Using "#upphi 90" in each | 
| 1988 | + | BSDF input file gets back the original behavior, where it | 
| 1989 | + | assumes that the up direction is 90-degrees from the X-axis. | 
| 1990 | + | The default value of 0 corresponds to PAB's definition of | 
| 1991 | + | the X-axis as being "up". | 
| 1992 | + |  | 
| 1993 | + | Fixed bug in rsensor related to having many rows (altitude) and | 
| 1994 | + | few columns (azimuth) in sensitivity file. | 
| 1995 | + |  | 
| 1996 | + | Fixed floating point round-off error in new Hessian calculation | 
| 1997 | + | for some sytems (Windows, primarily). | 
| 1998 | + |  | 
| 1999 | + | Fixed bug in tensor tree BSDF code that caused bus error on | 
| 2000 | + | some systems, and may have been source of other errors as well. | 
| 2001 | + |  | 
| 2002 | + | (Above changes included in 4.2.2 patch release.) | 
| 2003 | + |  | 
| 2004 | + | Improved ambient extrapolation to avoid zero values.  Actual | 
| 2005 | + | threshold set to 5% of recorded value. | 
| 2006 | + |  | 
| 2007 | + | Changed anisotropic Gaussian and Ashikhmin models so that | 
| 2008 | + | illegal orientation vectors are dealt with more gracefully. | 
| 2009 | + |  | 
| 2010 | + | Created wrapBSDF tool and incorporated into genBSDF along | 
| 2011 | + | with new rfluxmtx computation. | 
| 2012 | + |  | 
| 2013 | + | Initial check-in of Roland Schregle's photon map integration. | 
| 2014 | + | New 5.0a version designation as suggested by Andy McNeil. |